DOI: https://doi.org/10.15587/1729-4061.2017.103151

Investigation of physical and chemical properties and structure of tripolyphosphate coatings on zinc plated steel

Olena Vlasova, Vadym Kovalenko, Valerii Kotok, Sergey Vlasov, Anna Cheremysinova

Abstract


The results of complex studies on the influence of the concentration of aqueous sodium tripolyphosphate solution on the physicochemical properties and structure of the coats on zinc-plated steel are presented. The coats were chemically deposited from 2–14 % aqueous sodium tripolyphosphate (STPP) solutions, heated to 70 ºС. It has been established that increasing concentration of aqueous STPP solution leads to an increase of the specific mass and crystallinity of the coats and decrease of protective properties. Metallographic studies have shown that the amorphous structure of the coats deposited from 2 % aqueous STPP solution changes to a structure with large sizes of crystallites for the coats prepared from aqueous STPP solutions with higher concentrations. The results of the X-ray diffraction (XRD) analysis have revealed that the coats with low protective properties, in addition to anhydrous zinc phosphates, also contain hydrated species. By means of raster electron microscopy, it has been established that the coats with the lowest protective properties, prepared from 12–14 % aqueous STPP solutions, are formed as thick, spongy layers with the presence of microcracks. Such structure leads to the accumulation and containment of moisture, which promotes corrosion under atmospheric conditions. 


Keywords


composition; coat structure; zinc-plated steel; protective properties; sodium tripolyphosphate; aqueous solution

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References


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Vlasova, E., Kovalenko, V., Kotok, V., Vlasov, S., Sknar, I., Cheremysinova, A. (2017). Investigation of composition and structure of tripolyphosphate coating on low carbon steel. Eastern-European Journal of Enterprise Technologies, 2 (6 (86)), 4–10. doi: 10.15587/1729-4061.2017.96572

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Fahim, I., Kheireddine, A., Belaaouad, S. (2013). Sodium tripolyphosphate (STPP) as a novel corrosion inhibitor for mild steel in 1M HCl. Journal of optoelectronics and advanced materials, 15 (5-6), 451–456.

Vlasova, E. V., Kovalenko, V. L., Kotok, V. A. (2015). Izuchenie prirody tripolifosfata zheleza i sostava tripolifosfatnogo pokrytiya gravimetricheskim metodom s promyvkoy. Zbirnyk naukovykh prats' NHU, 46, 136–144.

Vlasova, E. V. (2015). Osobennosti struktury poverhnosti mezhoperacionnyh tripolifosfatnyh pokrytiy. Metallurgicheskaya i gornorudnaya promyshlennost', 3, 59–62.

Hain, I. I. (1973). Teoriya i praktika fosfatirovaniya metallov. Leningrad: Himiya, 312.

Vlasova, E. V., Karasik, T. L. (2010). Issledovanie pokrytiy, poluchennyh iz vodnyh rastvorov fosfatov. Zhurn. Metallurgicheskaya i gornorudnaya promyshlennost', 5, 89–91.


GOST Style Citations


Sankara Narayanan, T. S. N. Surfuce pretreament by phosphate conversion coatings [Text] / T. S. N. Narayanan // Rev. Adv. Mater. Sci. – 2005. – Issue 9. – Р. 130–177.

Grigoryan, N. S. Fosfatirovanie [Text]: uch. pos. / N. S. Grigoryan, E. F. Akimova, T. A. Vagramyan. – Moscow: Globus, 2008. – 144 p.

Vagramyan, T. A. Fosfatirovanie. Sovremennoe sostoyanie i perspektivy razvitiya v Rossii [Text] / T. A. Vagramyan, N. S. Grigoryan, D. V. Mazurova et. al. // Korroziya: materialy, zashchita. – 2011. – Issue 2. – P. 22–27.

Kropacheva, O. I. Poluchenie fosfatnyh pokrytiy na ocinkovannoy stali i issledovanie ih svoystv [Text] / O. I. Kropacheva, T. S. Devyatkina, N. A. Skornyakova, S. I. Sanina. – Moscow: Globus, 2003. – 367 p.

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Abrashov, A. A. Sovershenstvovanie rastvorov kristallicheskogo fosfatirovaniya [Text] / A. A. Abrashov, N. S. Grigoryan, T. A. Vagramyan, E. F. Akimova // Gal'vanika i obrabotka poverhnosti. – 2010. – Vol. 18, Issue 3. – P. 48–52.

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Vlasova, E. Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis [Text] / E. Vlasova, V. Kovalenko, V. Kotok, S. Vlasov // Eastern-European Journal of Enterprise Technologies. – 2016. – Vol. 5, Issue 5 (83). – P. 33–39. doi: 10.15587/1729-4061.2016.79559 

Vlasova, E. Investigation of composition and structure of tripolyphosphate coating on low carbon steel [Text] / E. Vlasova, V. Kovalenko, V. Kotok, S. Vlasov, I. Sknar, A. Cheremysinova // Eastern-European Journal of Enterprise Technologies. – 2017. – Vol. 2, Issue 6 (86). – P. 4–10. doi: 10.15587/1729-4061.2017.96572

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Burlov, V. V. Lokal'naya korroziya oborudovaniya sovremennogo neftepererabatyvayushchego zavoda [Text] / V. V. Burlov, A. I. Al'cybeeva, T. M. Kuzikova // Izvestiya Sankt – Peterburgskogo gosudarstvennogo tekhnologicheskogo universiteta (tekhnicheskogo universiteta). – 2011. – Issue 11 (37). – P. 92–96.

Fahim, I. Sodium tripolyphosphate (STPP) as a novel corrosion inhibitor for mild steel in 1M HCl [Text] / I. Fahim, A. Kheireddine, S. Belaaouad // Journal of optoelectronics and advanced materials. – 2013. – Vol. 15, Issue 5-6. – P. 451–456.

Vlasova, E. V. Izuchenie prirody tripolifosfata zheleza i sostava tripolifosfatnogo pokrytiya gravimetricheskim metodom s promyvkoy [Text] / E. V. Vlasova, V. L. Kovalenko, V. A. Kotok // Zbirnyk naukovykh prats' NHU. – 2015. – Issue 46. – P. 136–144.

Vlasova, E. V. Osobennosti struktury poverhnosti mezhoperacionnyh tripolifosfatnyh pokrytiy [Text] / E. V. Vlasova // Metallurgicheskaya i gornorudnaya promyshlennost'. – 2015. – Issue 3. – P. 59–62.

Hain, I. I. Teoriya i praktika fosfatirovaniya metallov [Text] / I. I. Hain. – Leningrad: Himiya, 1973. – 312 p.

Vlasova, E. V. Issledovanie pokrytiy, poluchennyh iz vodnyh rastvorov fosfatov [Text] / E. V. Vlasova, T. L. Karasik // Zhurn. Metallurgicheskaya i gornorudnaya promyshlennost'. – 2010. – Issue 5. – P. 89–91.







Copyright (c) 2017 Olena Vlasova, Vadym Kovalenko, Valerii Kotok, Sergey Vlasov, Anna Cheremysinova

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061